دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a chemical compound of calcium, sulphur, and oxygen, CaSﾰ4. Although sometimes considered a contaminant of drilling fluids, it may at times be added to them to produce certain proper- ties. Like calcium carbonate it forms scales in waterhandling facilities, which may be hard to remove. See anhydrite, gypsum.